CVE-2026-15923 Infinite loop denial of service in Zephyr SDIO byte-I/O from a card-supplied zero max_blk_size

The Zephyr SDIO subsystem function sdioiorwextendedhelper in subsys/sd/sdio.c finishes transfers with a byte-I/O loop that uses size = MINremaining, func-cis.maxblksize as the per-iteration step. The value func-cis.maxblksize is decoded directly from the SDIO card's CIS FUNCE tuple in sdiodecodec...